As seen in Figure 3, expression levels of several melanoma stem cell markers (NGFR, NES, ABCB5, BMI1, CXCR6, CD13, CD90, CD133, CD44, ABCG2, EpCAM, and CD20 [21–25]) were analyzed in parental or drug-selected cells. The gene discussed is BMI1; the disease is melanoma.